For those of you who weren't able to attend my talk at TechEd 2006 on the file formats, you can actually view it online here: http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032297834&EventCategory=5&culture=en-US&CountryCode=US
The quality of the video isn't great, but it actually does a decent job capturing the demos. The background for the PPT slides doesn't come through too clearly though (but it's not really that big of a deal). You'll also have to deal with my mono-tone presentation style, but hopefully the content helps where I fall short. :-)
It looks like you need to provide a bit of information before you can download the video which is pretty lame, but for now I haven't found a way around that. Maybe I'll just take the video and have them post it up on OpenXMLDeveloper.org site so that you don't have to go through the extra hassle.